Hi again!
Sorry I was away in these last few days.
Unfortunately, you can’t create these milky shadows with Lightroom.
Even if you reduce the contrast and use a linear curve in the “ToneCurve”.
Lighroom will always try its best to keep the blacks.. black!

In Aperture, you are free to mess around with your images using the “Curves” and “Levels” like you do in Photoshop.

Now that Lightroom 4 (beta) has added the RGB curves, it will be easier to create this kind of presets with Lightroom as well.
Not quite the same controls (Aperture can add more than 1 RGB curves control + other color adjustments and textures)but it’s a step forward for Lightroom users.